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Finding the Fourth Proportional to 76.47, 114.15 and 74.64

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Solution

The fourth proportional to 76.47, 114.15 and 74.64 is: 111.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    76.47 : 114.15 = 74.64 : x
  2. Step 2: Convert to fraction form
    76.47/114.15 = 74.64/x
  3. Step 3: Cross multiply
    76.47x = 114.15 × 74.64
  4. Step 4: Simplify right side
    76.47x = 8,520.16
  5. Step 5: Solve for x
    x = 8,520.16/76.47
  6. Step 6: Final answer
    x = 111.42

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.